they have facial recognition technology. they're examining all the evidence they've collected so far, including pieces of the bomb. we saw pictures yesterday, which have now been distributed widely today of those bomb piece, including the pressure cooker. some of the ball bearings that were included in that bomb. and the shredded black backpack that carried one of the bombs. we've seen those images. the f.b.i. is analyzing those images and with them, they may be able to link that bag to someone in the crowd carrying that bag and put the bag down and walked away. >> thank you. i want to you stand down for the next hour as we move on. the point you make about the f.b.i. and a 5:00 o'clock briefing. these next two hours are critical and certainly that briefing at 5:00 o'clock will be a major source of information, not just for us, but everybody watching this story and waiting for the latest news. former f.b.i. bomb technician danny defenbaugh is with me. he helped lead the investigation after the oklahoma city bombing in april